package containertest;

import java.sql.Connection;
import java.util.LinkedList;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @功能
 * @创建时间 2019/12/20
 * 使用lock和condition来实现
 * 比较两种方法，condition可以更精确指定那些线程被唤醒
 */
public class MyContainer2<T> {
    final private LinkedList<T> lists = new LinkedList<>();
    final private int MAX = 10; //最多10个元素
    private int count = 0;
    private Lock lock = new ReentrantLock();
    private Condition producer = lock.newCondition();
    private Condition consummer = lock.newCondition();

    public void put(T t){
        try {
            lock.lock();
            while (lists.size() == MAX){ // 不用if
                producer.await(); //等待执行
            }
            lists.add(t);
            ++count;
            consummer.signalAll(); // 循环消费者线程进行消费
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
    }
    public T get(){
        T t = null;
        try{
            lock.lock();
            while (lists.size() == 0){
                consummer.await();
            }
            t =lists.removeFirst();
            count--;
            producer.signalAll(); //通知生产者生产,至同治生产者
        } catch (InterruptedException e) {
            e.printStackTrace();
        }finally {
            lock.unlock();
        }
        return t;
    }

    public static void main(String[] args) {
        MyContainer2<String> c = new MyContainer2<>();
        // 启动消费者线程
        for (int i=0;i<10;i++){
            new Thread(()->{
                for(int j=0;j<5;j++){
                  System.out.println(c.get());
                }
            }).start();
        }
        try {
            TimeUnit.SECONDS.sleep(2);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        // 启动生产者线程
        for(int i=0;i<2;i++){
            new Thread(()->{
                for(int j=0;j<25;j++)
                    c.put(Thread.currentThread().getName()+""+j);
            },"p"+i).start();
        }
    }
}
